feat: 添加 Markdown 终端渲染支持（glamour）

cmd/hxclaw/internal/helpers.go

@@ -118,3 +118,38 @@ func (r *SimpleReader) ReadString() (string, error) {
 	}
 	return line, nil
 }
+
+func FindParagraphEnd(text string, startPos int) int {
+	if startPos >= len(text) {
+		return 0
+	}
+
+	inCodeBlock := false
+	inMathBlock := false
+
+	for i := startPos; i < len(text); i++ {
+		if i+3 < len(text) && text[i:i+3] == "```" {
+			if !inCodeBlock {
+				inCodeBlock = true
+			} else {
+				inCodeBlock = false
+			}
+			continue
+		}
+
+		if i+2 < len(text) && (text[i:i+2] == "$$" || text[i:i+2] == "\\[") {
+			inMathBlock = !inMathBlock
+			continue
+		}
+
+		if inCodeBlock || inMathBlock {
+			continue
+		}
+
+		if i+1 < len(text) && text[i] == '\n' && text[i+1] == '\n' {
+			return i + 2
+		}
+	}
+
+	return 0
+}